27 Apr 12 18:38, Mark Hofmann wrote to Roy Witt:   
      
      
      
    RW>> He was looking for a thicker oil than the 5w-40 that he had been   
    RW>> using.   
    RW>>   
    RW>> Where he lives, he could use a 20w-50 and get the same desired   
    RW>> effect.   
    RW>>   
    RW>> What he's trying to do is lower the possibility of that noisy lifter   
    RW>> leaking down. Going to a heavier viscosity might be the answer to   
    RW>> less leak down.   
      
    MH> I'm starting to wonder if the opposite might be what I want.  The   
    MH> main reason being that I don't get the noisy lifter (cold tap) when   
    MH> the weather is warm or hot.  The cold mornings, it does it the most   
    MH> and loudest.  On a hot summer day, a cold start makes little to no   
    MH> noise.   
      
    MH> Since the heat should be making the oil thinner, I would think that   
    MH> might be the way to go.   
      
   If you're using a multi-weight oil, think viscosity. i.e. with 10w-30,   
   think of the 10w viscosity as winter flow. Today's multi-weight oils are   
   tested for flow at controlled tempuratures, the 10w meaning that the oil   
   will flow like a 10 weight oil at a cold temp such as is encountered in   
   the winter time.   
      
   The 30 in that nomenclature means that the oil will flow (viscosity) like   
   a 30 weight oil at a higher temp. So, the warmer 10w-30 oil gets, the   
   closer to the viscosity of a 30 weight oil, rather than that of a 10   
   weight oil.   
      
   When you park the car overnight, the warm engine temp will keep that   
   leaky lifter from leaking down for a longer period of time, hopefully   
   keeping its 30 weight or heavier viscosity longer. If its a garage kept   
   vehicle, it may not get cold enough to thin out the viscosity and keep the   
   lifter pumped.   
      
      
                   R\%/itt   
      
      
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     ... find out how far one can go ~ TS Eliot   
      
      
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